gdb/inf-child.c

   1 /* Default child (native) target interface, for GDB when running under
   2    Unix.
   3
   4    Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   5    1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #include "defs.h"
  25 #include "regcache.h"
  26 #include "memattr.h"
  27 #include "symtab.h"
  28 #include "target.h"
  29 #include "inferior.h"
  30 #include "gdb_string.h"
  31
  32 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  33    for all registers.  */
  34
  35 static void
  36 inf_child_fetch_inferior_registers (int regnum)
  37 {
  38   if (regnum == -1)
  39     {
  40       for (regnum = 0; regnum < NUM_REGS; regnum++)
  41         regcache_raw_supply (current_regcache, regnum, NULL);
  42     }
  43   else
  44     regcache_raw_supply (current_regcache, regnum, NULL);
  45 }
  46
  47 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  48    this for all registers (including the floating point registers).  */
  49
  50 static void
  51 inf_child_store_inferior_registers (int regnum)
  52 {
  53 }
  54
  55 void
  56 inf_child_post_wait (ptid_t ptid, int wait_status)
  57 {
  58   /* This version of Unix doesn't require a meaningful "post wait"
  59      operation.  */
  60 }
  61
  62 static void
  63 inf_child_post_attach (int pid)
  64 {
  65   /* This version of Unix doesn't require a meaningful "post attach"
  66      operation by a debugger.  */
  67 }
  68
  69 /* Get ready to modify the registers array.  On machines which store
  70    individual registers, this doesn't need to do anything.  On
  71    machines which store all the registers in one fell swoop, this
  72    makes sure that registers contains all the registers from the
  73    program being debugged.  */
  74
  75 static void
  76 inf_child_prepare_to_store (void)
  77 {
  78 }
  79
  80 static void
  81 inf_child_open (char *arg, int from_tty)
  82 {
  83   error ("Use the \"run\" command to start a Unix child process.");
  84 }
  85
  86 static void
  87 inf_child_post_startup_inferior (ptid_t ptid)
  88 {
  89   /* This version of Unix doesn't require a meaningful "post startup
  90      inferior" operation by a debugger.  */
  91 }
  92
  93 static void
  94 inf_child_acknowledge_created_inferior (int pid)
  95 {
  96   /* This version of Unix doesn't require a meaningful "acknowledge
  97      created inferior" operation by a debugger.  */
  98 }
  99
 100 static int
 101 inf_child_insert_fork_catchpoint (int pid)
 102 {
 103   /* This version of Unix doesn't support notification of fork
 104      events.  */
 105   return 0;
 106 }
 107
 108 static int
 109 inf_child_remove_fork_catchpoint (int pid)
 110 {
 111   /* This version of Unix doesn't support notification of fork
 112      events.  */
 113   return 0;
 114 }
 115
 116 static int
 117 inf_child_insert_vfork_catchpoint (int pid)
 118 {
 119   /* This version of Unix doesn't support notification of vfork
 120      events.  */
 121   return 0;
 122 }
 123
 124 static int
 125 inf_child_remove_vfork_catchpoint (int pid)
 126 {
 127   /* This version of Unix doesn't support notification of vfork
 128      events.  */
 129   return 0;
 130 }
 131
 132 static int
 133 inf_child_follow_fork (int follow_child)
 134 {
 135   /* This version of Unix doesn't support following fork or vfork
 136      events.  */
 137   return 0;
 138 }
 139
 140 static int
 141 inf_child_insert_exec_catchpoint (int pid)
 142 {
 143   /* This version of Unix doesn't support notification of exec
 144      events.  */
 145   return 0;
 146 }
 147
 148 static int
 149 inf_child_remove_exec_catchpoint (int pid)
 150 {
 151   /* This version of Unix doesn't support notification of exec
 152      events.  */
 153   return 0;
 154 }
 155
 156 static int
 157 inf_child_reported_exec_events_per_exec_call (void)
 158 {
 159   /* This version of Unix doesn't support notification of exec
 160      events.  */
 161   return 1;
 162 }
 163
 164 static int
 165 inf_child_can_run (void)
 166 {
 167   return 1;
 168 }
 169
 170 static struct symtab_and_line *
 171 inf_child_enable_exception_callback (enum exception_event_kind kind,
 172                                      int enable)
 173 {
 174   return (struct symtab_and_line *) NULL;
 175 }
 176
 177 static struct exception_event_record *
 178 inf_child_get_current_exception_event (void)
 179 {
 180   return (struct exception_event_record *) NULL;
 181 }
 182
 183 static char *
 184 inf_child_pid_to_exec_file (int pid)
 185 {
 186   /* This version of Unix doesn't support translation of a process ID
 187      to the filename of the executable file.  */
 188   return NULL;
 189 }
 190
 191 struct target_ops *
 192 inf_child_target (void)
 193 {
 194   struct target_ops *t = XZALLOC (struct target_ops);
 195   t->to_shortname = "child";
 196   t->to_longname = "Unix child process";
 197   t->to_doc = "Unix child process (started by the \"run\" command).";
 198   t->to_open = inf_child_open;
 199   t->to_post_attach = inf_child_post_attach;
 200   t->to_post_wait = inf_child_post_wait;
 201   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 202   t->to_store_registers = inf_child_store_inferior_registers;
 203   t->to_prepare_to_store = inf_child_prepare_to_store;
 204   t->to_insert_breakpoint = memory_insert_breakpoint;
 205   t->to_remove_breakpoint = memory_remove_breakpoint;
 206   t->to_terminal_init = terminal_init_inferior;
 207   t->to_terminal_inferior = terminal_inferior;
 208   t->to_terminal_ours_for_output = terminal_ours_for_output;
 209   t->to_terminal_save_ours = terminal_save_ours;
 210   t->to_terminal_ours = terminal_ours;
 211   t->to_terminal_info = child_terminal_info;
 212   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 213   t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
 214   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 215   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 216   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 217   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 218   t->to_follow_fork = inf_child_follow_fork;
 219   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 220   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 221   t->to_reported_exec_events_per_exec_call =
 222     inf_child_reported_exec_events_per_exec_call;
 223   t->to_can_run = inf_child_can_run;
 224   t->to_enable_exception_callback = inf_child_enable_exception_callback;
 225   t->to_get_current_exception_event = inf_child_get_current_exception_event;
 226   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 227   t->to_stratum = process_stratum;
 228   t->to_has_all_memory = 1;
 229   t->to_has_memory = 1;
 230   t->to_has_stack = 1;
 231   t->to_has_registers = 1;
 232   t->to_has_execution = 1;
 233   t->to_magic = OPS_MAGIC;
 234   return t;
 235 }